Be sure to practice proper battery safety when using an external charger. 

The MC1 by Xtar is hands down the simplest and most effective charger out there. Xtar is known for manufacturing some of the most funtional and high quality battery chargers out there, and this little device is no exception. Designed to work with any 5V USB outlet, you can pretty much plug this little fella in anywhere and charge your batteries! The MC1 can fit any 3.6V/3.7V lithium-ion cells from as small as 10440 to as large as 26650.

The charger has multiple built-in safety features such as temperature monitoring, reverse polarity protection, and also has a 1 year manufacturer warranty!

MC1 Compatibility:

• 3.6V / 3.7V Li-ion
• IMR / INR / ICR
• 10440, 14500, 14650, 16340, 17335, 17500, 17670, 18350, 18490, 18500, 18650, 18700
• 20700, 21700, 22650, 25500
• Flat-26650